CN219610486U - Composite current collector, pole piece and battery - Google Patents
Composite current collector, pole piece and battery Download PDFInfo
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- CN219610486U CN219610486U CN202321862405.7U CN202321862405U CN219610486U CN 219610486 U CN219610486 U CN 219610486U CN 202321862405 U CN202321862405 U CN 202321862405U CN 219610486 U CN219610486 U CN 219610486U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of batteries, and discloses a composite current collector, a pole piece and a battery. The composite current collector comprises an intermediate insulating layer and a current collecting layer, wherein the intermediate insulating layer comprises a first surface and a second surface which is opposite to the first surface; the current collecting layer comprises a first current collecting layer and a second current collecting layer, the first current collecting layer is arranged on the first surface, the second current collecting layer is arranged on the second surface, the first current collecting layer is provided with a plurality of first hole structures, the second current collecting layer is provided with a plurality of second hole structures, the first hole structures and the second hole structures are arranged in a staggered mode, and the range of the sum T of the thicknesses of the first current collecting layer, the middle insulating layer and the second current collecting layer is more than or equal to 4 mu m and less than or equal to 12 mu m. The pole piece provided by the utility model comprises the composite current collector. The battery provided by the utility model comprises the pole piece. The composite current collector provided by the utility model obviously reduces the risks of thermal diffusion and thermal runaway in the process of battery puncture, and can obviously improve the safety of batteries.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a composite current collector, a pole piece and a battery.
Background
The lithium ion battery has the advantages of large volume and mass energy density, long cycle life, high nominal voltage, low self-discharge rate, small volume, light weight and the like, and has wide application in the consumer electronics field. With the recent rapid development of electric vehicles and mobile electronic devices, there is an increasing demand for lithium ion batteries in terms of energy density, safety, cycle performance, and the like.
The lithium ion battery monomer comprises a positive plate, a separation film, a negative plate and a liquid electrolyte, wherein the positive plate and the negative plate are mainly prepared by adopting a wet coating mode. The monomer structure has the following problems: (1) The copper foil cathode or aluminum foil anode has high mass specific gravity and has great influence on specific energy of the battery; (2) When the battery encounters severe use environment, such as extrusion or puncture of sharp hard substances, internal short circuit is easy to occur, and at the moment, the copper foil and the aluminum foil have good conductivity, and short circuit large current is formed inside the battery or rapidly, so that thermal runaway is easy to be caused, and the safety of the battery is greatly reduced; (3) The copper foil or aluminum foil current collector with compact structure has poor adhesion, and the electric contact between the active material and the current collector is obviously deteriorated after the coating and drying process or long-time use, so that the electrochemical characteristics of the battery such as multiplying power and the like are affected. In the related art, a nano conductive carbon layer is generally coated on a copper foil or an aluminum foil for improving adhesion, electron conductivity or heat conduction characteristics, but specific energy and safety cannot be effectively improved.
Disclosure of Invention
The utility model aims to provide a composite current collector, a pole piece and a battery, and aims to solve the problems of high mass specific gravity and low safety of the current collector in the prior art and improve the safety and specific energy of the battery.
To achieve the purpose, the utility model adopts the following technical scheme:
a composite current collector comprising:
an intermediate insulating layer including a first surface and a second surface disposed opposite the first surface;
the current collecting layer comprises a first current collecting layer and a second current collecting layer, wherein the first current collecting layer is arranged on the first surface, the second current collecting layer is arranged on the second surface, the first current collecting layer is provided with a plurality of first hole structures, the second current collecting layer is provided with a plurality of second hole structures, the first hole structures and the second hole structures are arranged in a staggered mode, and the range of the sum T of the thicknesses of the first current collecting layer, the middle insulating layer and the second current collecting layer is more than or equal to 4 mu m and less than or equal to 12 mu m.
Alternatively, the thickness t1 of the intermediate insulating layer is in the range of 2 μm.ltoreq.t1.ltoreq.5 μm.
Optionally, the thickness t2 of the first current collecting layer ranges from 1 μm to 6 μm; and/or, the thickness t3 of the second current collecting layer is in the range of 1 μm or less and t3 or less and 6 μm or less.
Optionally, the first hole structure and the second hole structure are both provided as circular hole-shaped structures.
Optionally, the diameters of the first hole structures are d1, the distances between the axes of two adjacent first hole structures are d2, and the relationship between d1 and d2 satisfies: d2-d 1)/d 1 is more than or equal to 0.5 and less than or equal to 2; and/or the diameter of the second hole structure is d3, the distance between the axes of two adjacent second hole structures is d4, and the relationship between d3 and d4 satisfies: the ratio of d4-d3 to d3 is more than or equal to 0.5 and less than or equal to 2.
Optionally, a plurality of the first hole structures and a plurality of the second hole structures are each distributed in an array.
Optionally, the materials of the first current collecting layer and the second current collecting layer are metal foil or alloy foil.
Optionally, the material of the intermediate insulating layer is an electronically insulating high molecular polymer.
The pole piece comprises the composite current collector, positive electrode slurry and negative electrode slurry, wherein the positive electrode slurry is filled in the first hole structure, and the negative electrode slurry is filled in the second hole structure.
The battery comprises the pole piece.
The utility model has the beneficial effects that: according to the composite current collector, the intermediate insulating layer is arranged between the first current collecting layer and the second current collecting layer, the sum T of the thicknesses of the first current collecting layer, the intermediate insulating layer and the second current collecting layer is more than or equal to 4 mu m and less than or equal to 12 mu m, and the thicknesses of the intermediate insulating layer, the first current collecting layer and the second current collecting layer can be flexibly regulated and controlled; the arrangement of the middle insulating layer can obviously reduce the risks of thermal diffusion and thermal runaway in the process of battery puncture and improve the safety of the battery; the first current collecting layer is provided with a plurality of first hole structures, the second current collecting layer is provided with a plurality of second hole structures, and the mass percentage of inactive substances can be remarkably reduced due to the arrangement of the hole structures, so that the specific energy of the battery is improved; the first hole structure and the second hole structure are arranged in a staggered mode, and the mechanical strength of the composite current collector is guaranteed.
The pole piece provided by the utility model comprises the composite current collector, the positive electrode slurry and the negative electrode slurry, wherein the positive electrode slurry is filled in the first hole structure, the negative electrode slurry is filled in the second hole structure, and the pole piece is low in mass percentage of inactive substances and good in mechanical strength.
The battery provided by the utility model comprises the pole piece, has higher safety and better electrochemical performance, and has low risk of thermal diffusion and thermal runaway in the puncturing process and high specific energy.
Drawings
Fig. 1 is an exploded view of a composite current collector provided by an embodiment of the present utility model;
fig. 2 is a cross-sectional view of a composite current collector provided by an embodiment of the present utility model.
In the figure:
100. an intermediate insulating layer; 110. a first surface; 120. a second surface; 210. a first current collecting layer; 211. a first aperture structure; 220. a second current collecting layer; 221. a second pore structure.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.
In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The embodiment improves a composite current collector, and aims to solve the problems of higher mass specific gravity and low safety of the current collector in the prior art.
As shown in fig. 1 and 2, the composite current collector includes an intermediate insulating layer 100 and a current collecting layer, the intermediate insulating layer 100 including a first surface 110 and a second surface 120 disposed opposite the first surface 110; the current collecting layer comprises a first current collecting layer 210 and a second current collecting layer 220, the first current collecting layer 210 is arranged on the first surface 110, the second current collecting layer 220 is arranged on the second surface 120, the first current collecting layer 210 is provided with a plurality of first hole structures 211, the second current collecting layer 220 is provided with a plurality of second hole structures 221, the first hole structures 211 and the second hole structures 221 are arranged in a staggered mode, and the sum T of the thicknesses of the first current collecting layer 210, the middle insulating layer 100 and the second current collecting layer 220 is more than or equal to 4 mu m and less than or equal to 12 mu m.
In the composite current collector provided by the embodiment, the intermediate insulating layer 100 is arranged between the first current collecting layer 210 and the second current collecting layer 220, the sum T of the thicknesses of the first current collecting layer 210, the intermediate insulating layer 100 and the second current collecting layer 220 is in the range of 4 μm or less and 12 μm or less, and the thicknesses of the intermediate insulating layer 100, the first current collecting layer 210 and the second current collecting layer 220 can be flexibly regulated and controlled; the arrangement of the middle insulating layer 100 can obviously reduce the risks of thermal diffusion and thermal runaway in the process of battery puncture and improve the safety of the battery; the first current collecting layer 210 is provided with a plurality of first hole structures 211, the second current collecting layer 220 is provided with a plurality of second hole structures 221, and the mass percentage of inactive substances can be remarkably reduced due to the arrangement of the hole structures, so that the specific energy of the battery is improved; the first hole structures 211 and the second hole structures 221 are arranged in a staggered manner, so that the mechanical strength of the composite current collector is ensured.
Optionally, the plurality of first hole structures 211 and the plurality of second hole structures 221 are distributed in an array, so as to uniformly reduce the mass of the inactive material and effectively increase the specific energy. Secondly, it is also possible to ensure that the current collector has uniform mechanical strength.
In this embodiment, the first hole structures 211 and the second hole structures 221 may be configured as circular hole structures, which is easy to manufacture. In other embodiments, the first hole structures 211 and the second hole structures 221 may be configured in other shapes, such as a triangle structure, a square structure, an oval structure, or the like, as desired.
Further, the diameter of the first hole structures 211 is d1, the distance between the axes of two adjacent first hole structures 211 is d2, and the relationship between d1 and d2 satisfies: d2-d 1)/d 1 is more than or equal to 0.5 and less than or equal to 2; and/or, the diameter of the second hole structures 221 is d3, the distance between the axes of two adjacent second hole structures 221 is d4, and the relationship between d3 and d4 satisfies: the ratio of d4-d3 to d3 is more than or equal to 0.5 and less than or equal to 2. By reasonably regulating the diameter and the distance of the pore structure, the mechanical strength and the adhesiveness of the current collector can be effectively increased, and the electrochemical performance is further enhanced.
Alternatively, the thickness t1 of the intermediate insulating layer 100 ranges from 2 μm.ltoreq.t1.ltoreq.5 μm. The thickness t1 of the intermediate insulating layer 100 should not be excessively large to ensure the specific energy of the battery; the thickness t1 of the intermediate insulating layer 100 is not preferably too small to ensure that the intermediate insulating layer 100 has sufficient mechanical strength.
Optionally, the material of the intermediate insulating layer 100 is an electronically insulating polymer, which has flexibility and electronically insulating properties. Illustratively, the electronically insulating high molecular polymer may be one or a combination of several of polyethylene, polypropylene, polyimide, polyaramid.
In the present embodiment, the thickness t2 of the first current collector layer 210 is in the range of 1 μm.ltoreq.t2.ltoreq.6μm; and/or, the thickness t3 of the second current collector layer 220 ranges from 1 μm to 6 μm. Too large a thickness of the first and second current collecting layers 210 and 220 may reduce the manufacturing speed, and too small a thickness of the first and second current collecting layers 210 and 220 may not ensure sufficient electron conduction ability.
Optionally, the materials of the first current collecting layer 210 and the second current collecting layer 220 are metal foil or alloy foil. Illustratively, the material of the first current collector layer 210 is aluminum foil, and the material of the second current collector layer 220 is aluminum foil. Alternatively, the material of the first current collector layer 210 is copper alloy foil, and the material of the second current collector layer 220 is copper alloy foil. In other embodiments, the materials of the first current collecting layer 210 and the second current collecting layer 220 may be two different metals and their alloy foils.
In practical use, the first hole structure 211 and the second hole structure 221 can be filled with an electronic insulating polymer, so as to reduce the risk of short circuit and improve the safety. Alternatively, the first hole structure 211 is filled with the positive electrode paste, and the second hole structure 221 is filled with the negative electrode paste, so that the specific energy and the energy density can be improved.
The present embodiment also provides a pole piece, which includes the above composite current collector, and positive electrode slurry and negative electrode slurry, wherein the positive electrode slurry is filled in the first hole structure 211, and the negative electrode slurry is filled in the second hole structure 221. The pole piece has low mass percent of inactive substances and good mechanical strength.
The embodiment also provides a battery, which comprises the pole piece, has higher safety and better electrochemical performance, is low in risk of thermal diffusion and thermal runaway in the puncturing process, and has high specific energy.
It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.
Claims (10)
1. A composite current collector, comprising:
an intermediate insulating layer (100) comprising a first surface (110), a second surface (120) arranged opposite to said first surface (110);
the current collecting layer comprises a first current collecting layer (210) and a second current collecting layer (220), wherein the first current collecting layer (210) is arranged on the first surface (110), the second current collecting layer (220) is arranged on the second surface (120), the first current collecting layer (210) is provided with a plurality of first hole structures (211), the second current collecting layer (220) is provided with a plurality of second hole structures (221), the first hole structures (211) and the second hole structures (221) are arranged in a staggered mode, and the range of the sum T of the thicknesses of the first current collecting layer (210), the middle insulating layer (100) and the second current collecting layer (220) is less than or equal to 4 mu m and less than or equal to 12 mu m.
2. The composite current collector according to claim 1, wherein the thickness t1 of the intermediate insulating layer (100) ranges from 2 μm to t1 to 5 μm.
3. The composite current collector according to claim 1, wherein the thickness t2 of the first current collector layer (210) ranges from 1 μm ∈t2+.6μm; and/or, the thickness t3 of the second current collecting layer (220) is in the range of 1 μm.ltoreq.t3.ltoreq.6μm.
4. The composite current collector according to claim 1, wherein the first hole structure (211) and the second hole structure (221) are each provided as a circular hole-shaped structure.
5. The composite current collector of claim 4, wherein the diameter of the first hole structures (211) is d1, the distance between the axes of two adjacent first hole structures (211) is d2, and the relationship between d1 and d2 satisfies: d2-d 1)/d 1 is more than or equal to 0.5 and less than or equal to 2; and/or, the diameter of the second hole structures (221) is d3, the distance between the axes of two adjacent second hole structures (221) is d4, and the relationship between d3 and d4 satisfies: the ratio of d4-d3 to d3 is more than or equal to 0.5 and less than or equal to 2.
6. The composite current collector of claim 1, wherein a plurality of said first hole structures (211) and a plurality of said second hole structures (221) are each distributed in an array.
7. The composite current collector of claim 1, wherein the first current collector layer (210) and the second current collector layer (220) are both metal foil or alloy foil.
8. The composite current collector according to claim 1, wherein the material of the intermediate insulating layer (100) is an electronically insulating high molecular polymer.
9. Pole piece, characterized in that it comprises a composite current collector according to any one of claims 1-8, and a positive electrode paste and a negative electrode paste, the positive electrode paste being filled in the first hole structure (211) and the negative electrode paste being filled in the second hole structure (221).
10. A battery comprising a pole piece according to claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321862405.7U CN219610486U (en) | 2023-07-17 | 2023-07-17 | Composite current collector, pole piece and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321862405.7U CN219610486U (en) | 2023-07-17 | 2023-07-17 | Composite current collector, pole piece and battery |
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| CN219610486U true CN219610486U (en) | 2023-08-29 |
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| CN202321862405.7U Active CN219610486U (en) | 2023-07-17 | 2023-07-17 | Composite current collector, pole piece and battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117276468A (en) * | 2023-11-23 | 2023-12-22 | 宁德时代新能源科技股份有限公司 | Negative electrode plate, battery and electricity utilization device |
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2023
- 2023-07-17 CN CN202321862405.7U patent/CN219610486U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117276468A (en) * | 2023-11-23 | 2023-12-22 | 宁德时代新能源科技股份有限公司 | Negative electrode plate, battery and electricity utilization device |
| CN117276468B (en) * | 2023-11-23 | 2024-04-12 | 宁德时代新能源科技股份有限公司 | Negative electrode plate, battery and electricity utilization device |
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